Large-scale variation in the composition of a casting or ingot caused by the gradual separation (especially from the surface to the centre) of the different constituents of the molten alloy as it solidifies.
Origin
1960s.
Definition of macrosegregation in US English:
macrosegregation
nounˌmakrə(ʊ)sɛɡrɪˈɡeɪʃn
Metallurgy
Large-scale variation in the composition of a casting or ingot caused by the gradual separation (especially from the surface to the centre) of the different constituents of the molten alloy as it solidifies.